Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1989-11-30
1992-04-14
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
4301066, 430111, 430137, G03G 900, G03G 500, G03G 9083
Patent
active
051047640
ABSTRACT:
Disclosed a process for the preparation of polymer particles, which comprises suspending a polymerizable monomer, a radical initiator and a hardly soluble inorganic dispersant in a dispersion medium and carrying out polymerization in this state, wherein a hardly soluble inorganic dispersant, the solubility of which is changed according to the pH value in the dispersion medium and which is precipitated at a pH value within a certain pH value region of the dispersion medium, is used as the dispersant, suspension of the polymerizable monomer in the dispersion medium is carried out in the state where the dispersant is dissolved in the dispersion medium, an acid or base is then added to adjust the pH value of the dispersion medium to a predetermined level to precipitate the dispersant, and the polymerization is initiated in the state where oil drops having a fine particulate size are formed.
The process is effectively utilized for obtaining a toner having good flowability and blocking resistance and excellent developing and fixing properties by using a colorant together with the polymerizable monomer.
REFERENCES:
patent: 4507378 (1985-03-01), Wada et al.
patent: 4521508 (1985-06-01), Mori et al.
patent: 4816366 (1989-03-01), Hyosu et al.
patent: 4849318 (1989-06-01), Tsubota et al.
Hirano Nobuhiro
Ota Hideki
Shimoyama Hiroshi
Tokuno Toshiro
Wada Tomonori
Crossan Stephen C.
McCamish Marion E.
Mita Industrial Co. Ltd.
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